Liquid sealed pump



'April"2'0, 1937. F. L. BUENGER 2,077,394

LIQUD SEALED PUMP Filed May 28, 1954 l i @wfg/ia@ A Patented Apr. 20, 1937 UNITED STATES PATENT ori-ice 2,077,394 LIQUID SEALED PUMP i Application May ze, 1934, serial No. 727,860 claims. (cl. 23o-205) This invention relates to vacuum and pressure pumps of a typegsealed by `liquid and has more particular reference to pressure and vacuum Dumps withan oil sealing reservoir incorporated 5 as a part thereof.

An important object of this invention is in the provision of a liquid containing chamber which forms a seal for the pump for producing 'either a hightpressure or a vacuum. A further object 'm of the invention is to incorporate a liquid sealing chamber as an integral part of the pump itself to reduce leakage of pressure, to reduce loss of the sealing liquid, and to reduce the amount of liquid which is necessary to effectively-seal the Dump. l

A still further object of the invention is in the provision of means for preventing the sealing liquid or any large part thereof, from flowing into the pump chamber under any condition.

A further object of the invention is in the provision ofspring yokes connected to opposite pumping vanes with recesses in the end plates for containing the spring yokes. 4

A further object of the invention is in the pro-fy '25 vision of a lubricating passage from the sealing chamber to the recess in the end plate for lubricating the spring yokes at both ends of the pumpI rotor.

Other objects ofthe invention are in the provision of an improved seal surrounding the shaft in the packing gland; to provide cooling vanesfor the pump; to provide a combined taper and screw iit for the air inlet; to provide a pressure chamber and an improved seal therefor; and in general to produce the construction herein shown Such a construction -is not only bulky and cum- .p

bersome but also it is heavy, requires too much oil, and is liable to admit anobjectionable quan- 50 tity of oil tothe pump chamber so vthat when the pump is first startedafter being idle, the presence of the sealing liquid may cause a breakagel of the parts.

Thepresent inventionovercomes hese objec- 55 tions by' providing a sealing liquid d pressure chamber formed as an integral part of the stationaryv member of the pump with a passage lead-v ing therefrom to the communicating recessesat the ends of the rotor for lubricating the pump. vanes, sealing them, and forcing them outwardly Y under pressure. v

Referring now more particularly to the drawing,A a purnp casing member 4 has a horizontal cylinder or bore 5 open at the ends, a supporting base and intermediate cooling ribs 1. Above the cylinder 5 are integral walls 8 and 9 forming a chamber IIl for a sealing liquid I Il and providing a pressure space above the liquid.

In the wall between the cylinder bore 5 and the chamber I0 is an inlet passage I2 slightly tapered toward its lower end and having passages I3 and I4 leading from the lower end thereof into the,

cylinder bore 5. An outlet passage I5 through rthis wall has an outer enlargement I6 forming a seat in the passage for receiving a. ball I'I which acts as a valve therein and across the upper or discharge end of this passage is a retainer I8 which may be a flapvalve secured at one side for a fastening screw I9 or litmay be simply a narrow strap extending across the passage to prevent the ball Il from dislodgment from the passage.

Secured to the top of the walls 8 and 9 is a cover 2U through which is threaded afpipe 2| to make a fluid-tight joint therewith, the pipe having a reduced extension 22 with an extremity. adapted to nt tightly in the tapered opening I2- and to make a Huid-tight joint therewith when the cover is tightly secured in place. Also extending through the cover 20 is a fitting 23 for transferring the pressure therefrom. -If the pump is to be used for pressure a connection is made with the fitting 23 and if it is to be used for suction a connection is made with the pipe 2 I.

Mounted eccentrically in the cylinder 5 is a rotor 25 having parallel slots 26 extending oppositely and at an angle 'from the'` opposite faces of the rotor. These slots extend to the ends of the rotor which fits tightly against the wall of the cylinder between the inletand outlet openings I3 and I5. In the slots 26 are vanes 21 havingouter covered ends which engage the inner surface of the cylinder bore 5 and make `a tight contact therewith for the full length of the rotor. At the endsof the vanes are 'projections 28, the corresponding ends each connected by Ia tension spring yoke 29 which extends beyond that end of the rotor. These spring4 yokes tend to force the vanes outwardly at al1 timesso that there isl l' no difiiculty in providing pressure or suction from 

